Ascaris lumbricoides is a parasite that causes disease when contaminated food containing its eggs is ingested. Infections are usually asymptomatic, especially if the number of worms is small. However, they may be accompanied by inflammation, fever, diarrhea, and other serious problems. Detection of specific IgM antibodies is evidence of a current or recent infection. A demonstration of specific IgG to the bacteria is evidence of past infection.
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